205100145 has 12 divisors (see below), whose sum is σ = 355506996. Its totient is φ = 109386720.

The previous prime is 205100111. The next prime is 205100167. The reversal of 205100145 is 541001502.

It can be written as a sum of positive squares in 2 ways, for example, as 35892081 + 169208064 = 5991^2 + 13008^2 .

It is not a de Polignac number, because 205100145 - 2¹² = 205096049 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2278846 + ... + 2278935.

It is an arithmetic number, because the mean of its divisors is an integer number (29625583).

Almost surely, 2^205100145 is an apocalyptic number.

It is an amenable number.

205100145 is a deficient number, since it is larger than the sum of its proper divisors (150406851).

205100145 is a wasteful number, since it uses less digits than its factorization.

205100145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557792 (or 4557789 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 205100145 is about 14321.3178513711. The cubic root of 205100145 is about 589.7328532977.

Adding to 205100145 its reverse (541001502), we get a palindrome (746101647).

The spelling of 205100145 in words is "two hundred five million, one hundred thousand, one hundred forty-five".